Calculating Sun Temperature from Tank Heat Absorption

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Discussion Overview

The discussion revolves around calculating the temperature of the Sun based on the heat absorption of a water tank using Stefan-Boltzmann's Law. Participants explore the relationship between energy absorbed by the tank, the surface area, and the implications of the inverse square law of light intensity. The conversation includes elements of problem-solving and theoretical application.

Discussion Character

  • Exploratory
  • Technical explanation
  • Homework-related
  • Mathematical reasoning

Main Points Raised

  • One participant proposes using the energy absorbed by the tank to calculate the Sun's temperature through Stefan-Boltzmann's Law.
  • Another participant questions the assumptions made in the problem, particularly regarding the distance to the Sun and its effect on light intensity.
  • Concerns are raised about the lack of specific constants, such as the constant of thermal conduction, which is necessary for calculating the calories absorbed by the water.
  • Some participants discuss the potential use of the specific heat of water, questioning whether it was provided in the course context.
  • There is a suggestion that the problem may not provide all necessary information, but typically, all required data is included in such problems.

Areas of Agreement / Disagreement

Participants express uncertainty about the assumptions and constants needed to solve the problem. There is no consensus on whether the problem provides sufficient information or how to proceed without certain constants.

Contextual Notes

The discussion highlights limitations regarding the assumptions made about constants and the context of the problem, particularly the absence of the specific heat of water and other necessary values.

Who May Find This Useful

This discussion may be useful for students and educators in physics or related fields, particularly those interested in thermodynamics and heat transfer calculations.

Bassalisk
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Lets take this specific example:


Sun is radiating heat and a water tank with a certain surface area S absorbs this heat.

Sun rays are perpendicular to this tank.

[PLAIN]http://pokit.etf.ba/get/778c2978a453178481d142a891ae07c5.jpg


If I know much energy did my tank of water absorbed in certain amount of time(Power), through Stefan-Boltzmann's Law, could I calculate the temperature of the sun?

Thanks
 
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Yea I see what he did there. But I have to solve this problem. Is my assumption right?

Full problem is here:
https://www.physicsforums.com/showthread.php?t=497347

but since nobody was answering it for a day, I figured why not try to break it into small parts and then try to solve it...

I am stuck and I need an answer fast.
 
I did not respond to the other strand because the answer is not evident to me, but perhaps I can spark some insight.

Do you see in the original problem that you can calculate the number of calories that went into the water? And, with the time and area, the flux?

Based on what you've said, I think you do.

Can you assume in the problem that you know the distance to the sun? Do you see any way to use that and the inverse square law of light intensity to find the flux at the suns surface?
 
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Fewmet said:
I did not respond to the other strand because the answer is not evident to me, but perhaps I can spark some insight.

Do you see in the original problem that you can calculate the number of calories that went into the water? And, with the time and area, the flux?

How can I calculate those calories when the c, constant of thermal conduction is not given...
 
I see it was not given, but I don't know the context of the problem. Do you think you are permitted to use a physical constant like the specific heat of water? Was it introduce in the course previously, perhaps in the definition of the calorie?
 
Fewmet said:
I see it was not given, but I don't know the context of the problem. Do you think you are permitted to use a physical constant like the specific heat of water? Was it introduce in the course previously, perhaps in the definition of the calorie?

They are always giving us everything we need to solve a problem. I am not overruling that they forgot, but usually we don't use that table.

I will let you know, tomorrow I will find out an answer.
 
Bassalisk said:
They are always giving us everything we need to solve a problem. I am not overruling that they forgot, but usually we don't use that table.

I will let you know, tomorrow I will find out an answer.

I'd appreciate that. Looking back at the problem, I don't you can possibly do anything without know that one calorie raises the temperature of one gram of water by 1ºC.
 

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